You can add a rule to include specific paths in the content index, to exclude specific paths from the index, to specify how Microsoft SharePoint lists are handled, or to provide a specific account to access a specific path. For more information about rules that include or exclude content, see About Rules That Include or Exclude Content.
If you select this option, when the search component encounters a resource within this space, it will neither crawl the resource nor follow links contained within the resource.
If you select this option, you can also do the following:
Following complex links includes additional content in the content index.
By default, SharePoint lists are crawled as one item. If you do not click Allow alerts on individual SharePoint list items, alerts for the list will be sent if any item in the list is changed.
Your password is protected and can be used only to access the needed resources for the purpose of crawling content.
The server will attempt to use NTLM authentication. If NTLM authentication fails, the server will attempt to use Basic authentication unless the Prohibit the server from passing plain text passwords check box is selected. If the check box is selected, the server will attempt to use NTLM authentication only.
For more information about using client certificates, see Using Client Certificates When Crawling Content.